package com.kuang.add;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

/**
 * @program: juc
 * @description: 计数信号量
 * @author: 陈恩涛
 * @create: 2021-02-24 10:06
 **/
public class SemaphoreDemo {
    public static void main(String[] args) {

        //线程数量：停车位! 限流
        Semaphore semaphore = new Semaphore(3);

        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                //acquire
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName()+"抢到车位！");
                    TimeUnit.SECONDS.sleep(2);
                    System.out.println(Thread.currentThread().getName()+"离开车位！");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    //release
                    semaphore.release();
                }
            },String.valueOf(i)).start();
        }
    }
}
